JPH0663576B2 - Gas shutoff valve - Google Patents

Description

Detailed Description of the Invention a. Purpose of the invention a-1. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a gas cutoff valve provided at an inlet of a supply pipe of a gas consumer such as city gas or propane gas.

B-2. Conventional technology In order to prevent unexpected accidents due to gas, there is a microcomputer meter that the gas meter built-in microcomputer closes the gas shut-off valve that is built into the gas meter by judging an abnormal gas flow rate. As shown in Japanese Unexamined Patent Publication No. 61-7419, the shut-off valve section and the return section have separate structures, and when the valve is opened after the valve is closed, the return shaft is rotated to return the valve. In addition to the gas meter, there is a gas shut-off valve which is interlocked with the gas leak alarm and is closed by a gas leak signal from the alarm, which is disclosed in Japanese Patent Laid-Open No. 61-8619. The shut-off valve section and the return section had an integral structure.

B-3. Problems to be Solved by the Present Invention Among the above-mentioned two conventional techniques, the former has a structure in which the shut-off valve portion and the return portion are separate structures, so that it is troublesome to assemble and process, and the cost is high, and the shape is large. In addition, after closing the valve,
There was a problem that the valve would not operate if the player mischiefly intentionally stopped the rotation of the return shaft.

Also, if the shut-off valve section and the return section are integrated as in the latter case, it is necessary to gas seal the movable plunger with an O-ring or diaphragm, and sliding resistance or displacement resistance adversely affects the shut-off operation. That is, there is a problem that the operating power required when the valve is closed is large and the variation is large.

B. Structure of the invention b-1. MEANS FOR SOLVING PROBLEMS The present invention relates to a gas seal means O for closing a shutoff valve when the shutoff valve section and the return section are integrated to facilitate assembly work.
It is an object of the present invention to solve the above-mentioned problems by providing a structure in which the sliding resistance of the ring does not adversely affect the operating power.

That is, the first plunger (6) having the valve element fixed at one end
And a spring (9) for urging this valve element in the valve closing direction and the first
Second plunger (5) arranged concentrically with the other plunger and with its one end abutting against the other end of the first plunger (5)
And a return button fixed to the other end of this second plunger
(16), a return spring (10) for urging the second plunger in the direction of the return button, and a stopper (4) for positioning the second plunger (5) against the force of the return spring. , A permanent magnet (1) for attracting both plungers in the abutting direction, a guide pipe (13) having an O-ring (14) on the outer circumference, with a first plunger sliding inside, and a wire arranged on the outer circumference And a positioning stopper (4) for the second plunger (5),
The permanent magnet (1) is provided with a recess for holding the gas seal member (15), which is arranged so as to form a magnetic circuit with the yokes (2), (3) applied to the side circumference of the permanent magnet (1). Characterize.

B-2. Function Normally, the shutoff valve is open. At this time, the abutting portions of the two plungers are in close contact with each other and are attracted by the action of the magnetic force of the permanent magnet.

Then, the second plunger hits the stopper and is positioned by the force of the return spring. That is, it is in the return position (valve open state). When an exciting current flows through the wire ring due to an abnormal gas flow rate or a valve closing signal due to a gas leak alarm, the lines of magnetic force flowing through the abutting parts of both plungers weaken, and the attraction force due to the magnetic force decreases, and the first plunger moves to the second The spring moves away from the plunger in the valve closing direction (direction away from the second plunger), and the valve element comes into contact with the valve seat to close (shut off) the valve.
After the abnormality such as gas leakage is recovered, the shutoff valve is opened (returned).
When trying, the return button provided on the second plunger is pressed. Then, the second plunger moves toward the first plunger against the return spring. And the tip of the second plunger (the side without the return button)
When hits the tip of the first plunger on the non-valve side, the magnetic lines of force of the permanent magnet pass through the abutting portions of the two plungers, and the two plungers are attracted by the magnetic force at the abutting portions. Then release the return button and the second
The plunger is restored by the force of the return spring until the first plunger is attracted, and the valve element fixed to the first plunger separates from the valve seat and opens. Then, the second plunger hits the stopper and stops. Thereafter, this valve open state continues until the coil is excited.

The gas seal member is provided on the second plunger, but when the second plunger is pushed by hand to move in the direction of the first plunger in the valve closing position, or when returning from the second plunger together with the first plunger attracted. When returning by the force of the spring, since it is moved by hand or by the return spring, the sliding resistance due to the gas seal member is overcome and the movement is ensured.

B-3. Embodiment In FIG. 1, (1) is a permanent magnet, and yokes (2), (3), (4)
A magnetic path is formed by the first plunger (6) and the second plunger (5). One end of the first plunger (6) (left end in the figure) and one end of the second plunger (5) (right end in the figure) are abutted as shown in the drawing, and attracted by the magnetic force of the magnetic force line passing through this abutting part. Has been done. (7) is a spring bearing, and (8) is a valve element, both of which are fixed to the other end of the first plunger.

(9) is a spring for urging the valve body (8) in the valve closing direction (to the right in the figure). (10) is a return spring for urging the second plunger (5) to the left in the figure, that is, in the valve opening direction, (11) is a bobbin around which the wire ring (12) is wound, and (13) is a cylindrical guide pipe. Then, the two plungers (5) and (6) are slidably guided in the left-right direction in the figure. (1
The O-ring inserted between the support member (20) and the guide pipe (13) in 4), and (15) and (18) are gas sealing members provided in the second plunger (5), both of which are O-rings. It is composed of.

The second plunger (5), which is urged in the valve opening direction (leftward in the figure) by the return spring (10), is stopped from moving leftward by the yoke (4) acting as a stopper. The stop position is set to the position.

(16) is a return button fixed to the other end (left end) of the second plunger (5), (17) is a gas passage opened in the valve seat (21) of the gas meter, and (19) is a gas cutoff valve. This is packing when the support member (20) is attached to the gas meter with the mounting screw (22). The symbol (A) indicates the abutting portion of both plungers.
The force of the return spring (10) and the attraction force by the magnetic force of the abutting parts of both plungers are both set to be larger than the force of the spring (9), especially the force of the return spring (10) is the force of the spring (9). And the sliding resistance of the gas seal member (18) and the sliding resistance when both plungers move to the left in the gas pipe (13) are set sufficiently larger than the sum. The spring (9) is in the valve closing direction (right in the figure) and the return spring (10) is in the opening / closing direction (left in the figure).
And the first and second plungers (6) and (5) are energized respectively.

Now, when an exciting current temporarily flows through the wire ring (12) due to a gas leak signal or the like, the magnetic force lines passing through the abutting portions (A) of both plungers decrease and the attraction force decreases, so the spring (9)
Action causes the abutting parts of both plungers to separate from each other, the first plunger (6) moves in the valve closing direction (to the right in the figure), and the valve body
(8) is pressed against the valve seat (21) to shut off the gas passage (17).

At this time, the sliding resistance of the first plunger moving to the right (valve closing direction) is only friction with the guide pipe (13),
It is very small and there is no sliding resistance such as O-ring.
Therefore, it is light and operates reliably. To return (open) the gas shutoff valve that is in the shutoff (closed) state, press the return button (16).
Is pushed to the right in the figure, that is, in the valve closing direction, and is moved until the right end of the second plunger comes into contact with the left end of the first plunger in the valve closing position, the attraction force by the magnetic field lines of the permanent magnets acts. Both plungers are attracted to each other at the abutting part (butting part). Then, when the release button (16) is released, both plungers move in the valve opening direction (left in the figure) by the force of the return spring (10) and stop by hitting the yoke (4) that functions as a stopper. Move up to.

The valve is kept open by the permanent magnet (1) until the next shut-off signal excites the coil (12).

C. EFFECTS OF THE INVENTION According to the present invention, since the shutoff valve portion and the return portion can be integrated,
Of course, it is easy to assemble and can downsize the whole, but since the first plunger has no gas seal,
The electric power for exciting the coil, that is, the operating electric power for driving the gas cutoff valve is small, and variations can be reduced. When the return button is operated and the valve is open, the valve can be opened at any time by sending an excitation signal to the coil. Therefore, since it is not possible to intentionally operate the return button from the outside to hold the valve open, it is possible to prevent the valve from being held open due to mischief.

In particular, in the present invention, the positioning stopper of the second plunger is arranged in the magnetic circuit so as to function as a yoke, and the holding recess for the gas seal member is provided, so that one member can perform three functions. is there.

[Brief description of drawings]

 FIG. 1 is a horizontal sectional view of an embodiment of the present invention. (1) …… Permanent magnet (4) …… Yoke acting as stopper (5) …… Second plunger (6) …… First plunger (8) …… Valve disc (9) …… Spring (10) ...... Return spring (12) …… Wire ring (13) …… Guide pipe (15) (18) …… Gas seal member (16) …… Return button

Claims (1)

[Claims] 1. A first plunger having a valve element fixed to one end thereof.
(6), a spring (9) for urging the valve body in the valve closing direction, and a second plunger (1) arranged concentrically with the first plunger and having one end abutted against the other end of the first plunger. Five)
And a return button fixed to the other end of this second plunger
(16), a return spring (10) for urging the second plunger in the direction of the return button, and a stopper (4) for positioning the second plunger (5) against the force of the return spring. , A permanent magnet (1) that attracts both plungers in the butting direction, and
The plunger slides and has a guide pipe (13) having an O-ring (14) on its outer periphery and a wire ring (12) arranged on the outer periphery thereof, and further has a positioning stopper () for the second plunger (5). 4) is
The permanent magnet (1) is provided with a recess for holding the gas seal member (15), which is arranged so as to form a magnetic circuit with the yokes (2), (3) applied to the side circumference of the permanent magnet (1). Characteristic gas cutoff valve.